Thanks, I down loaded a water calculator. That is a big help, it looks like i should add 2-2.5g of CaSO4 and 3.5-4g of CaCl2 along with 2-3ml of acid. which gives me a Cl to SO4 ration of 1 and a pH of 5.48 without to much Ca (100ppm),
Would 2.5ml of lactic acid change the flavour at all...